Recently, the first round of test experiments of the subsystem "fusion engineering reactor central solenoid system" of the national major scientific and technological infrastructure "fusion reactor host key system" built and operated by the Plasma Institute of the Chinese Academy of Sciences Hefei Institute of Physical Sciences completed, and the maximum test current reached steady state 48kA, exceeding the design value of 47kA. The experimental results show that the facility has achieved a total energy storage of 406.7MJ, a usable test magnet inner diameter of 1500mm, a maximum field strength of 12T, and a joint resistance of 0.1n Ω, fully meeting the design specifications and becoming the largest and most complete large-scale superconducting magnet dynamic performance testing system in the world in terms of size and experimental conditions. The goal of the "Fusion Engineering Reactor Center Solenoid System" is to build a large-scale superconducting magnet and experimental system, conduct a series of experiments on the strong electromagnetic field, rapid changes in high voltage, and system reliability of the superconducting center solenoid magnet under future operating conditions of fusion engineering reactors, and lay a solid foundation for the construction of fusion engineering reactors in China and obtain sufficient operating condition data. After nearly 10 years, the project team has solved many key scientific and technological problems such as the design of superconducting magnets for large fusion reactors, low resistance superconducting joints, insulation of ultra-low temperature magnets, quench protection, safety control of large low-temperature, high current power supplies, and rapid magnetic field changes. They have successfully developed and built the largest superconducting magnet and testing system, achieving 100% localization of superconducting magnet materials, equipment, and systems. The construction of this system not only provides good experimental conditions for future fusion reactors, but also provides a first-class large-scale testing platform for other fields such as low temperature, materials, condensed matter physics, superconductivity applications, etc. (New Society)